Top seal head

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a top seal head which comprises an upper seal head and a lower seal head which are oppositely arranged, auxiliary heating blocks are respectively arranged on the side parts of the upper seal head and the lower seal head, each auxiliary heating block is provided with a heating mounting hole, and the heating mounting holes are provided with temperature control heating pieces for transferring heat to the auxiliary heating blocks. And the auxiliary heating block is used for heat-sealing the tabs of the battery cell in the top sealing area of the battery cell. According to the utility model, the sealing stability of the tab position can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a top-sealing head. Background Art

[0002] There are three materials, namely metal strip, ear glue and aluminum plastic film, at the position of the electrode tab of the soft-pack battery cell. Compared with other positions, the thickness is thicker, and more auxiliary heat is required during encapsulation. Especially when the battery cell is thicker, the electrode tab is also thicker, resulting in poor sealing stability at the position of the electrode tab. It can be seen that it is difficult for the existing technology to effectively seal the position of the electrode tab of the soft-pack battery cell with large current charge and discharge and the soft-pack battery cell with thick electrode tab metal strip. Content of the Utility Model

[0003] The purpose of the utility model is to provide a top-sealing head aiming at the deficiencies of the existing technology, which has good auxiliary heating effect and can effectively improve the sealing stability of the electrode tab position.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A top-sealing head includes an upper head and a lower head which are oppositely arranged. Auxiliary heating blocks are respectively arranged on the sides of the upper head and the lower head. Each auxiliary heating block is provided with a heating installation hole, and a temperature control heating element for transferring heat to the auxiliary heating block is arranged in the heating installation hole. The auxiliary heating block is used to thermally seal the electrode tab of the battery cell in the top-sealing area of the battery cell.

[0006] As an improvement of the top-sealing head of the utility model, the heating temperature of the temperature control heating element is 120°C to 260°C. Within this range, the best sealing effect of the electrode tab position can be ensured, and it can ensure that the battery cell does not leak liquid and the metal strip position does not over-melt, that is, the sealing of other sealing areas will not be too thin or over-melt.

[0007] As an improvement of the top-sealing head of the utility model, the temperature control heating element has a constant temperature heating part, and the constant temperature heating part is externally connected to a constant temperature control circuit.

[0008] As an improvement of the top-sealing head of the utility model, the upper head and the lower head respectively have a head body. The head body includes a base and a head part arranged on the base. The auxiliary heating block is arranged on one side of the head part.

[0009] As an improvement of the top-sealing head of the utility model, the hot pressing part of the auxiliary heating block is arranged on the first support surface of the head part, and the first support surface has a top-sealing part spaced from the hot pressing part.

[0010] As an improvement of the top sealing head of the present utility model, the top sealing part has a top sealing groove facing the auxiliary heating block.

[0011] As an improvement of the top sealing head of the present utility model, the auxiliary heating block has a positioning part connected to the hot pressing part, and the positioning part is connected to one side of the sealing head part.

[0012] As an improvement of the top sealing head of the present utility model, the top sealing part and the first support surface form an L-shaped structure, and the top sealing part and the first support surface are integrally formed.

[0013] As an improvement of the top sealing head of the present utility model, the base and the sealing head part form a ⊥-shaped structure, the base is the “—” in the ⊥-shaped structure, and the sealing head part is the “|” in the ⊥-shaped structure, which can effectively improve the stability of top sealing.

[0014] As an improvement of the top sealing head of the present utility model, the auxiliary heating block is an L-shaped structure, and both the hot pressing part and the positioning part are straight structures.

[0015] The beneficial effects of the present utility model are as follows: The present utility model includes an upper sealing head and a lower sealing head which are oppositely arranged. Auxiliary heating blocks are respectively arranged on the sides of the upper sealing head and the lower sealing head. Each auxiliary heating block is provided with a heating installation hole, and a temperature control heating element for transferring heat to the auxiliary heating block is arranged in the heating installation hole. The auxiliary heating block is used to thermally seal the tab of the battery cell to the top sealing area of the battery cell. Among them, since the interior of the auxiliary heating block has a temperature control heating element, heat can be transferred through the auxiliary heating blocks of the upper and lower sealing heads, which can meet the heat required at the tab position of the battery cell and assist in the effective thermal sealing of the battery cell. Moreover, the temperature control heating element can flexibly and independently adjust its heating temperature, so that the top sealing head of the present utility model can adaptively ensure the reliable packaging of tabs of various sizes, effectively improving the versatility of the top sealing head. Description of the Drawings

[0016] Figure 1 It is a three-dimensional structure diagram of the upper sealing head or the lower sealing head of the present utility model.

[0017] Figure 2 It is a structural schematic diagram of the upper sealing head and the lower sealing head of the present utility model.

[0018] Wherein: 1. Auxiliary heating block; 1a. Hot pressing part; 2. Temperature control heating element; 3. Base; 4. Sealing head part; 41. First support surface; 42. Top sealing part; 420. Top sealing groove. Detailed Embodiments

[0019] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art should understand that manufacturers may use different names to refer to the same component. The specification and claims do not use the difference in names as a way to distinguish components, but rather use the difference in the functions of components as the criterion for distinction. As used throughout the specification and claims, the term "comprising" is an open-ended term and should be interpreted as "comprising but not limited to". "Substantially" means within an acceptable error range, and those skilled in the art can solve technical problems within a certain error range and basically achieve the technical effect.

[0020] In a utility model, unless otherwise clearly specified and limited, the term "connection" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and may also be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0021] The soft-pack battery cell is mainly encapsulated by heating the aluminum-plastic film to fuse the PP therein. The encapsulation of the aluminum-plastic film and the tab position is mainly achieved by heating and fusing the PP of the aluminum-plastic film and the tab glue at the tab position together. The inventor found that compared with other positions, this position is thicker, and there are two thicknesses at the encapsulation position, namely (aluminum-plastic film + tab metal strip + tab glue) and (aluminum-plastic film + tab glue). And there are three materials at the tab position of the battery cell, namely metal strip + tab glue + aluminum-plastic film, which makes this position thicker than other positions, resulting in greater difficulty in sealing the tab. In order to solve the problem of unstable sealing at the single-tab position and the risk of battery cell encapsulation failure caused by uncontrolled reliability of battery cell encapsulation, a new type of top-sealing head structure is designed.

[0022] The following will Figures 1-2 further describe the present utility model in detail in conjunction with the accompanying

[0023] Embodiment 1

[0024] A top-sealing head, see Figure 1 and Figure 2 , comprising an upper head and a lower head arranged oppositely. Auxiliary heating blocks 1 are respectively arranged on the sides of the upper head and the lower head. Each auxiliary heating block 1 is provided with a heating installation hole. The heating installation hole horizontally penetrates the side part of the auxiliary heating block 1. A temperature control heating element 2 for transferring heat to the auxiliary heating block 1 is arranged in the heating installation hole. The heating installation hole and the temperature control heating element 2 are of suitable sizes. The temperature control heating element 2 is located inside the auxiliary heating block 1. The auxiliary heating block 1 is used to thermally seal the tab of the battery cell to the top-sealing area of the battery cell.

[0025] Preferably, the heating temperature of the temperature-controlled heating element 2 can be adjusted as needed. The temperature-controlled heating element 2 is an independent component, and the heating temperature can be 120°C to 150°C, 150°C to 180°C, 180°C to 210°C, 210°C to 230°C, 230°C to 260°C. Within such a temperature range, it can ensure that the battery cell does not leak liquid and there is no over-melting at the position of the metal strip. Such a temperature range will not cause the seal in other sealed areas to be too thin and result in over-melting.

[0026] Preferably, the temperature-controlled heating element 2 has a constant-temperature heating part. The constant-temperature heating part can be externally connected to a constant-temperature control circuit. The overall shape of the temperature-controlled heating element 2 can be a heating tube. The heating tube has a fixed-resistance resistor to achieve constant-temperature heating, and one or more resistors in the heating tube constitute the constant-temperature heating part.

[0027] Preferably, the upper head and the lower head respectively have a head body. The head body includes a base 3 and a sealing part 4 provided on the base 3. The auxiliary heating block 1 is provided on one side of the sealing part 4.

[0028] Preferably, the base 3 and the sealing part 4 form a ⊥-shaped structure. The base 3 is the “—” in the ⊥-shaped structure, and the sealing part 4 is the “|” in the ⊥-shaped structure, so that both the upper head and the lower head have a stable pressing force.

[0029] Preferably, the hot pressing part 1a of the auxiliary heating block 1 is provided on the first support surface 41 of the sealing part 4. The first support surface 41 has a top sealing part 42 spaced from the hot pressing part 1a. The top sealing part 42 and the hot pressing part 1a of the auxiliary heating block 1 jointly heat the top-sealed battery cell.

[0030] Preferably, the top sealing part 42 and the first support surface 41 form an L-shaped structure, which can improve the hot pressing stability and hot pressing strength of the top sealing part 42.

[0031] Preferably, the top sealing part 42 has a top sealing groove 420 facing the auxiliary heating block 1. The top sealing groove 420 can accommodate a part of the aluminum-plastic film, the tab, and the tab glue, so as to effectively limit the aluminum-plastic film, the tab, and the tab glue in the top sealing area of the battery cell.

[0032] Preferably, the auxiliary heating block 1 has a positioning part connected to the hot pressing part 1a. The positioning part is connected to one side of the sealing part 4. The positioning part is connected to both the hot pressing part 1a and the sealing part 4, which can improve the hot pressing stability and hot pressing strength of the hot pressing part 1a.

[0033] Preferably, the auxiliary heating block 1 is an L-shaped structure, so that both the hot pressing part 1a and the positioning part are straight structures, and the hot pressing part 1a and the positioning part are perpendicular to each other, which can achieve the best top sealing effect for the battery cell.

[0034] Preferably, the auxiliary heating block 1 and the sealing head 4 are of an integral structure. In a limited space, the integral structure of the auxiliary heating block 1 and the sealing head can realize the top sealing and preheating of the battery cell. The packaging method of the top-sealing head is to carry out packaging and ear preheating simultaneously, which can effectively improve the space utilization rate of the overall structure.

[0035] Embodiment 2

[0036] In this embodiment, independent temperature controllers are separately provided for the upper and lower sealing heads. The temperature controllers are electrically connected to the temperature-controlled heating element 2 and can adjust the temperature of the temperature-controlled heating element 2 by themselves, so that the thickness of the ear, the thickness of the ear glue, and the thickness of the battery cell match the corresponding temperature, improving the packaging reliability at the ear position and enabling the temperature of the upper and lower sealing heads to be controllably adjusted within a self-selectable range.

[0037] For example: (60um - 100um) ear + (100um - 200um) ear glue, the temperature of the temperature-controlled heating element 2 and the auxiliary heating block 1 is set to 130 - 190°C; (100um - 800um) ear + (200um - 600um) ear glue, the temperature of the temperature-controlled heating element 2 and the auxiliary heating block 1 is set to 180 - 250°C. By flexibly setting the temperature of the upper and lower sealing heads, the versatility of the top-sealing head can be improved.

[0038] In addition, a 100W - 1000W heating tube is used in combination with an independent temperature controller for heating control. The auxiliary heating block 1 of the upper and lower sealing heads controls the auxiliary area heating through an independent heating tube. For thick / large ears and models that require more auxiliary heat for packaging, the temperature of the auxiliary heating block 1 can be reasonably adjusted and changed according to the actual packaging effect to ensure reliable packaging at the ear position, and at the same time improve the versatility and flexibility of the top-sealing head, break the limitations brought by the traditional sealing head design, and enhance the packaging flexibility and sealing stability.

[0039] The other structures of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0040] Obviously, through the structural design of the ear auxiliary heating area, the present invention mainly designs a new type of top-sealing head structure for large-current charge-discharge battery cells and battery cells with thick ear metal strips, which can not only meet the heat assistance required at the ear position but also ensure that no over-melting phenomenon occurs in other sealing areas, improving the product quality of the battery cell and the consistency of the sealing thickness, thereby effectively improving the service life of the battery cell product.

[0041] Based on the disclosure and teachings of the above specification, those skilled in the art to which the present utility model pertains can also make changes and modifications to the above embodiments. Therefore, the utility model is not limited to the above specific embodiments, and any obvious improvements, substitutions or variations made by those skilled in the art based on the present utility model all fall within the protection scope of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims

1. A top seal head, characterized in that: include: An upper sealing head and a lower sealing head are arranged opposite to each other, and auxiliary heating blocks (1) are respectively arranged on the sides of the upper sealing head and the lower sealing head; Each of the auxiliary heating blocks (1) is provided with a heating installation hole, and the heating installation hole is provided with a temperature-controlled heating element (2) for transferring heat to the auxiliary heating block (1). The auxiliary heating block (1) is used to heat-seal the tabs of the battery cell to the top sealing area of ​​the battery cell.

2. The top seal head according to claim 1, characterized in that: The heating temperature of the temperature-controlled heating element (2) is 120°C to 260°C.

3. The top seal head according to claim 2, characterized in that: The temperature-controlled heating element (2) has a constant temperature heating portion.

4. The top seal head according to claim 1, characterized in that: The upper head and the lower head respectively have a head body, the head body comprising a base (3) and a head portion (4) arranged on the base (3), and the auxiliary heating block (1) is arranged on one side of the head portion (4).

5. The top seal head according to claim 4, characterized in that: The hot pressing part (1a) of the auxiliary heating block (1) is arranged on the first supporting surface (41) of the sealing part (4), and the first supporting surface (41) has a top sealing part (42) arranged apart from the hot pressing part (1a).

6. The top seal head according to claim 5, characterized in that: The top sealing portion (42) has a top sealing groove (420) facing the auxiliary heating block (1).

7. The top seal head according to claim 5 or 6, characterized in that: The auxiliary heating block (1) has a positioning portion connected to the hot pressing portion (1a), and the positioning portion is connected to one side of the sealing portion (4).

8. The top seal head according to claim 5 or 6, characterized in that: The top sealing portion (42) and the first supporting surface (41) form an L-shaped structure.

9. The top seal head according to any one of claims 4 to 6, characterized in that: The base (3) and the sealing head (4) form a ⊥-shaped structure, wherein the base (3) is the “—” in the ⊥-shaped structure, and the sealing head (4) is the “|” in the ⊥-shaped structure.

10. The top seal head according to claim 7, characterized in that: The auxiliary heating block (1) is of an L-shaped structure.

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